Pressure-gage



J. A. BOWDEN.

y PRESSURE GAGE. ApPLlcATloN FILED AUG. I3. 1912. RENEwEn DEC. I. |918.

1,354,017, Pawntedsept. 28,1920t .on the attaching sleeve.

unirsi) sirza'riazs JUNIUS A. BOWDEN, OF LOS ANGELES-CALIFORNIA,ASSIGNOR TO A. 'SCHRADERS SON7 INCORPORATED, OF NEW YORK,4 N. Y., ACORPORATION OF NEW YORK,

PRESSURE-GAGE.

nestelt.

To all fw hola t may G01/Cera Be it known that l, J rNit's A. lolwDnN, acitizen ol the United States, residing at Los Angeles. in the county ofLos Angeles and State of California, have invented a new and usefulPressure-Gage, of which the following is a specification..

This invention relates to pressure gages which are attached to andcarried by the tire while the tire is in operation, enabling thepressure of the tires to be determined inl stantly by merely looking atthe gage. In a previous application of mine filed December 18,1911,Serial No. 666,601, I have shown such a gage and t'he present inventionhas for its object to furnish several improvements. thereon.

One object of theimprovement is to provide for adjusting the gage barwith respect to the air chamber.

Another object is to improve the shape of the air chamber.

Another object is to decrease the length of the gage.

Another .object is to provide a non-collapsible insertible gasket.

Another object is to form a stop shoulder Another object is to thelateral tube.

Another object is to -.provide improved means for securing the shield,lmaking it less expensive and quickly attachable.

Referring tothe drawings:

Figure 1 is an enlargedlongitudinal section through the gage.

Fig. 2 is a side elevation of the detachable shield. i

Fig. 3 is a side elevation of the spring.

. Fig. 4 is a bottom view of the shield.v

Fig. 5 is a section on line 5-x5 Fig. 1. Fig. 6 i's a detail sectionalview through a modified form of the attaching sleeve.

Fig. 7 is a section on line 'irl-m7 Fig. Fig. 8 is a perspective partlyin section showing the non-collapsible gasket.

Fig. 9 is a side elevation of a coupling form a stop flange on forconnecting the gage to a tire valve.

Fig. 10 is an`inverted plan of said courand. forms a positive stop toenable the at- Speccaton of Letters Patent.V lltglltgd Sept, 55. 1920 Y....j. 7.7. i Appncation filed August 13, 19127 Serial No. 714,897.Renewed December 7,

191s. seriai No. 265,786.

taching sleeve to be placed in the exact position required. Theattaching sleeve mav be internally threaded as shown at 5. in Fig. 6, sothat it can be secured on the end of the nipple 1. A set screw 6 isprovided to secure the sleeve. llvith` the unthreaded sleeve as shown inFig. 1. the sleeve in the assembled gage slides over theV threads 'ofthe tire valve.Y I

vScrewed. on the attaching sleeve 2 is a flanged coupling? which isrevoluble on a flange 8 on the lower end of a body 9. The body 9 has acentral air conduit 10 and recessed at one end to receive a gasket 11.0frubber or other suitable material for fitting against the end of thenipple 1 to make aii air-tight joint. ln order to prevent the .gasketfrom collapsing and closing the central air passage through it, a tube12 is inserted which forms a lining and prevents the rubber fromsqueezing together and reducing the size of the hole. This .is animportant feature andit also enables the gasket to be easily removedorinserted, as the tube and gasket are used asa unit, yet separatelyinserted or detached.

A lateral tube 13 communicates with the conduit 10 and extends from theside of the body 9 enabling a hose to be attached for inflating the tirewithout removing the gage. A cap 111 is screwed on the end-ofl tube 13.T he tube is provided with a flange 15 which acts as a stop t0 preventthe inflating hose or attachment being pushed too far over tlie tube 13,which would make it difficult to undercut recess 20 formed in a disk 21which l fits over the upper end of body 9 and rests on a shoulder 22.The-flange 1T and shoulder 19 are held tightly in place against the lnut18 and recessed portion 2.0 of' the disk 21 by nut Q3, screwing on body9, said mit' 9', when tightened.` pressing upwardly against theunderside of the disk 21. A recessed cap 24 is on the upper end of theair chamber andhas a flange 25 which forms a guide and also an abutmentfor keeping wire coils 26 in place, the latter encircling the air cham,-

ber to prevent lateral expansion of the walls of the air chamber.. Thelower end of coil 26 is confined by disk 21.

A barrel 27 has a flanged lower end 28 37 being screwed against the topof the' stud 36. The threads of the lock screw 37 engage the internalthreads of the hollow gage bar, the lock screwbein'g screwed intol placeby a screw driver inserted through the end of the vgage bar. The flangedend of Vstud 36 is Within the upper end of the air chamber and a nut. 38securely locks the air chamber and cap 24 and stud 36 together so thatno air can escape at this point, said cap and stud forming a closuremeans for the upper end of said chamber. A pin 39 inthe stud 36 engagesthe upper end of a coil extension spring 40, the lower end of the springengaging a pin 41 inthe body 9. The spring.40 interposes the properresistance to the outward expansive movement Kof the air chamber andbeing inside the air chamber materially reduces the length of the gage.

. hold the The gage bar may be adjusted with respect to the air chamberby its screw connection with the stud 36,.so that a given mark 34 willbe visible when a corresponding pressure is in the air chamber.

The upper end of the barrel has an intermediate reduced portion 42 witha bead 43 which is detachably engaged'by grooved spring sections 44formed integral with a shield` 45 having segmental Aopenings 46 toreveal the gage bain A glass tube47 is within the shield and gaskets 48at' both ends 'of `the glass tube effectually exclude dust and moisture.vIf a glass tube breaks the shield may be readily detached'to replacethe broken tube.

Coupling 7 is preferably slitted as shown at 7 in the form of a bayonetjoint and the end of the slitted portion bent in as shown in Fig. 10, togrip the thread on body 9 and Gage tightly in place.

What I claim is:

1. In a pressure gage, a barrel with a bead formed near itsy outer end,la shield with spring sections formed with a groove engaging said bead, agage bar adapted for projecting from the barrel within the shield,

and a glass tube between the shield and gage bar when projecting.

2. In a pressure gage, va rubber air chamber, a threaded stud engagingan end thereof, a tubular 'gage bar extending longitudinally from theAair chamber, and having a hollow internally threaded end adjustablyscrewed on said stud, and means within said hollow end for lockingthegagebar to the stud. 3'. In a pressure gage, a body, a' disk'on saidbody, said .disk having Ian undercut annular recess, a rubber airchamber with an external sloping shoulder fitting in said recess andhaving an inwardly` directed flange, means on said body engaging theinner flat face of the flange of said air chamber, and' a nut screwingonthe body and bearing against the disk for securing the foregoing'parts in airtight engagement with each other.

4. In a pressure gage, a body, a pin in the body, a rubber air chamberattached to the body, a spring within the air chamber, a flanged stud atthe upper end o f the air chamber, a pin in said stud, the ends of thespring being attached to said pins.4

5. In a pressure gage, a body, a disk thereon, a barrel with a flange, aflanged sleeve engaging the flange of thebarrel, the sleeve havingprongs bent under the disk, and means securing the disk 4to the body andholding the parts together.

6. In a pressure gage, a cylindrical rubber air chamber with an openingat each end, an abrupt internal shoulder formed integral -with saidchamber at each end thereof, and

means engaging the flange at one end for securing the body to a'tirevalve,.and means engaging the flange at the other end for securing agage bar thereto.

7. In a pressure gage, a cylindrical rubber air chamber with an openingat each end, an abrupt internal shoulder formed at each end thereof,means for connecting a gage bar at one end of the chamber, the other endofthe chamber having an external shoulder, means for attaching said endhaving the external shoulder toa body, and means 'for connecting thebody to a tire valve.

8. In a pressure gage, a cylindrical rubber air chamber, having anopening at its inner and outer ends, an internal shoulder at both ends,the inner end having means for con,n necting the vchamber to a body,closure means at the outer end of the air chamber, comprising adetachable cap with a central hole, a flan ed stud, the flange of saidstud bearing against the inner'face of the shoulder in the outer end ofthe chamber, the stud projectingthrough -the opening in the outer Iendof the air chamber and projecting ba'r to the said closure means at theouter end of the air chamber, and means lfor con-- necting thebodyto atire valve.

9. In apressure gage, a rubber air chamber, a stud with a flange insidethe air chamber, said stud projecting outside the air chamber, a -gagebar secured to the stud, and a lock screw within the gage barand bearingagainst the stud.

l0. A pressure gage' for pneumatic tires, comprising a longitudinallyextensible pressure responsive element, said pressure responsive elementcomprising an elastic tube, and a coiled spring for opposing movementsof said tube, the coiled portion of said spring i being arrangedinsideof and being of less length than said tube.

1l. In a pressure gage, a supporting body, a flange thereon, a disk onsaid body below said flange, said disk having an annular recess, aneXpansible air chamber with a flange below said first flange and seatedin Y said annular recess, and a nut on said body for forcing said flangeon the body and said disk toward each other to bind the flange of theair chamber therebetween within said I recess;

12. Ina .pressure gage, a supporting body, a flange thereon, a diskonsaid body below said flange, said disk having an annular recess, anexpansible air chamber with a flange below said first flange and seatedin said an'- nular recess, a nut on said body for forcing said flange onthe body and said disk toward each other to ,bind the flange of the airchamber therebetween withinv said recess,

. a barrel surrounding the air chamber, a

bar.

cap slidable in thebarrel and rsecured to said air chamber for guidingthe latter, a gage bar slidable in and protruding from said barrel` andhaving coperati've engage ment with the air chamber, and a springopposing outward movement of the gage 13, In a pressure gage, a body,.arubber air chamber on said body, a gage bar having an operativeengagement with said air chamber, a barrel inclosing the air chamber,

` inner end to the barrel.

14. In pressure gages for tires, a tubular metal body having a flange onits outer end and threaded below the flange, a rubber air chamber havingan inner flange at one end,

the lower portionvof the flange o'f said body adapted to bear againstthe upper portion of the flange of said chamber, a disk having a'central opening, the flanged end of the air chamber resting on the upperpart of said disk` said body slidably engaging the opening in said disk,a nut on the said threaded part of the body and acting on thedisk toforce it toward the body flange and so clamp the flange of theairchamber between the flange of the body and the disk to form betweenthese parts an air tight engagement, a barrel surrounding said airchamber, a gage bar adapted to be moved by the outer end of said chamberand protruding from the outer end of said barrel, means for re'- sistingoutward movement of the gage bar, the lower end of said body adapted tobe connected with theinlet tube of a tire.

l5. In a pressure gage for tires, a barrel, the outer end of said barrelbeing open and contracted to have two diameters, the outermost diameterbeing the lesser, a gage bar slidable in the outermost contractedportion, means within the barrel responsive to air pressure for movingthe gage bar in one di.- rection, means resisting this movement of thegage bar, there being a shoulder formed on thel contracted end of thebarrel between the portions of different diameters, aA glass tube withits end resting against said shoul- Y der, a metal tube secured to thecontracted portion of larger diameter, and housing said 'glass tube, themetal tube having segmental openings to expose the glass tube, the outerend of the metal tube supporting the outer 'end of the glass tube andretaining the glass tube in place. 16. In a pressure gage, a body, aflange thereon, a rubber air chamber with an in' wardly directed flangesurrounding the body and abutting the first flange, a disk surroundingthe body and bearing againstthe opposite face `of the'air chamberflange, and means for forcing said disk toward the body Hange to bindthe air chamber flange therebetween.

17. A pressure gage comprising a barrel open at its inner andouter ends,the outer end of the barrel being contracted and pro- .vided with 'ashoulder on the contracted portion, a glass tube with its inner endresting against said shoulder, a shield over the outer end of said tubeand extending longitudinally outside thev tube, said shield beingsecured to said barrel below said shoulder, a gage bar movable into saidglass tube, and means'within said barrel for operating said gage bar,said shield having `an opening through which the movements of said gagebar can be seen.

18. In a pressure gage, a body, a rubber air chamber withself-supporting walls on said body, avgage bar having an operativeengagement with said air chamber, a barrel inclosing the air chamber,and having an opening through which said gage bar is slidable, atransparent tube on the end of -said barrel adapted to receive the'endof seid my hand at Los Angeles, California, this 8th gage bar, and acylindrical shield secued day 'of August7 1912.

to the barrel over` said transparent tube and X protecting the same,said shield having seg- JUNIUS A' BOW'DEN' 5 mental openings, andpackingat each end In presence ofi of the tube. ARTHUR P. KNIGHT,

In testimony whereof have hereunto set A. CRANDATJL.

